JPS62279512A - Rotary head device - Google Patents

Abstract

PURPOSE:To stabilize adjustment of the height of a head chip even if the length in the radial direction of a rotary cylinder is short, by moving a screw engaging part engaged with a head height adjusting screw in accordance with movement of this screw to generate twist in a narrow part. CONSTITUTION:In the case of changing the height of a head chip 1, a head height adjusting screw 5 is rotated to move a screw part 2B of a head base 2 brought into contact with a rotating base 4 in such direction that this part 2B is separated from the rotating base 4. A narrow part 2C is twisted together with a head chip attaching part 2A and the head chip 1 to rotate the head around the narrow part 2C, and as the result, the height of the head chip 1 is changed. By this constitution, the stability and the reliability of height adjustment of the head chip are improved even if the length in the radial direction of the rotary cylinder is short.

Description

[Detailed description of the invention] 3. Detailed description of the invention Industrial applications The present invention is a video tape recorder (VTR).

Digital audio tape recorder (DAT).

The present invention relates to a rotary head device, such as a data recorder, which rotates the head to record and reproduce signals on a medium such as a tape.

BACKGROUND ART Conventionally, such rotary head devices, such as VTRs and DAs,
At T, the tape is wound around the tape guide drum at a predetermined angle and run, and signals are recorded and reproduced by a head slightly protruding from the surface of the tape guide drum.

For example, the lower cylinder is configured to guide the rotation, and the upper cylinder to which the head is attached serves as a rotation base. A head chip is fixed to the upper cylinder as a rotating base by screws via a head base fixed by adhesive or the like. The mounting of the heads on the upper cylinder requires precise adjustment of the relative heights, especially when a plurality of heads are used. On the other hand, there is a conventional method as shown in FIG. 7, which is exemplified in Japanese Utility Model Application Laid-Open No. 60-176i321.

That is, in FIG. 7, a head chip 100 is bonded to a head base 102, and the head base 102 is fixed to an upper cylinder 101, which is a rotation base, by a screw 103 located in an arrow 106 in the direction of the rotation center. A female screw 104 is formed on the upper cylinder 101, and a head height adjustment screw 106 is screwed into the upper cylinder 101. and head chip 100
When changing the height of the head, use the head height adjustment screw 105.
is rotated, the head base 102 is deflected, and the height of the head step 100 is changed as a result. Since such a configuration is performed by utilizing the deflection of the head base 102 due to the movement of the screw 105, the direction of the arrow 108 indicating the rotation center direction of the head height adjustment screw 106 and the screw 103, that is, the direction of the upper cylinder 101 is The radial distance Y is required to be relatively large, and as a result, the radial length X necessary for attaching the head chip 1oQ is required to be large.

On the other hand, with improvements in the performance of recording media (e.g. tape) and heads such as magnetic recording, it has become possible to obtain sufficient playback output even at low relative speeds between the recording medium and the head.As a result, the well-known 8InIn video and rotary head It is possible to use a small diameter tape guide cylinder as used in the DAT model. In the case of this small-diameter cylinder, it is difficult to take a sufficient length X of the cylinder radial direction of the head base 102, and it is not possible to take a sufficient distance Y, so the head base 102
Highly reliable head chip 1o that utilizes the deflection of 02.

It becomes extremely difficult to adjust the height of the head chip 100 and requires a huge bending force, so the height of the head chip 100 changes after a long period of deterioration due to the creep phenomenon of each upper cylinder 1 and head bay, X102. There was a fear that it would happen. Furthermore, reducing the diameter and thickness of the tape guide cylinder is an important factor because it contributes to making the entire device thinner, but in this case, the radius of the tape guide cylinder, where the head chip is attached, is also important. Since it is inevitable that a rotary transformer, etc. must be positioned in the direction, the head base cannot have a sufficient radial length becomes extremely difficult.

Problems to be Solved by the Invention In other words, the present invention enables stable and reliable head tip height adjustment even when the radial length of a rotating base such as a rotating cylinder is extremely small. It is.

Means for Solving the Problems The present invention has a rotating base to which the head base is attached, and a head height adjustment screw that engages with the base, and furthermore, the head base is attached to the rotating base by a fixing screw. A fixing part to be fixed, a head chip mounting part, a screw engaging part that extends from the head chip mounting part on the rotation center side and engages with the head height adjustment screw, and a screw engaging part from the head chip mounting part. The rotary head device is characterized in that it has a narrow portion that extends substantially in the rotational direction and connects to the fixed portion at a position reaching the fixed portion.

Effects According to the present invention, with the above-described configuration, as the head height adjusting screw moves, the screw engaging portion that engages with it moves, and by generating twist in the narrow width portion, the screw, which is a part of the head base, moves. The engagement part and the head chip attachment part are rotated together to move the height of the head chip attached to the head chip attachment part.

EXAMPLES Below, the present invention will be explained in detail using examples according to the present invention. FIG. 1 is a plan view showing the first example, and FIG. 2 is a sectional view thereof. In FIGS. 1 and 2, the rotation base 4 is fitted with a rotation shaft (not shown) and a rotation center hole 4A, and a disk (not shown) integrated with the rotation shaft is inserted into the hole 4B. screw (
(not shown). The head chip 1 is fixed to the head chip mounting portion 2A of the head base 2 by adhesive or the like, and the head base 2 is fixed to the rotating base 4 (by means of fixing screws 3) at the fixing portion 2F. A screw engaging part 2B is provided on the extension of the rotation center hole 4A side from the two head chip attaching parts, and the screw engaging part 2B is connected to the fixing part 4F by a groove 2D provided between the screw engaging part 2B and the fixing part 4F. Separated. Also, at a position halfway from the head chip attachment part 2A to the screw engagement part 2B, it extends approximately in the rotational direction 9 of the rotation base 4 and connects the head chip attachment part 2A and the screw engagement part 2B. It has a narrow width portion 2C. A female screw 4C is threaded on the rotary base 4 corresponding to the position of the screw engaging portion 2B, and a head height adjustment screw 5 is screwed into the female screw 4C. In such a configuration, when changing the height of the head chip 1, by rotating the head height adjustment screw 5, the screw engaging portion 2B of the head base 2 that is in contact with the head is moved from the rotating base 4 to the shaft. By moving the narrow width part 2C in the direction of separation and twisting the narrow width part 2C together with the two head chip mounting members and the head tip 1, the narrow width part 2C is rotated as the center of rotation, and as a result, the height of the head tip 1 is changed. .

FIG. 3 is a plan view showing a second embodiment of the present invention.
The figure is a sectional view thereof. For ease of understanding, parts that are substantially the same as those in the first embodiment are given the same reference numerals.

Therefore, to avoid redundancy, points that differ from the first embodiment will be explained with emphasis. In the second embodiment, since the head base θ on which another head chip 7 is mounted must be placed in a position extremely close to the rotation direction 9 of the head chip 10, the head chip mounting portion 2A and the screw engaging portion 2B are Although there is a pair of narrow width parts 2C interposed therebetween, the fixed part 2F is provided only on one side, and the other has a contact part 2E that simply contacts the rotating base 4. be. And the fourth
As shown in the figure, the screw engaging portion 2B of the head base 2 is provided with a hole through which the screw portion of the head height adjusting screw 5 can pass. A sink portion 5A having a diameter larger than that of this hole is provided at the end of the head height adjustment screw 6.

In such a configuration, when adjusting the height of the head chip 1, by rotating the head height adjustment screw 5, the shift flange portion 5A comes into contact with the screw engaging portion 2B of the head base 2 and moves, thereby attaching the head chip. The head chip 1 is twisted and rotated together with the portion 2A using the narrow portion 2C as a rotational fulcrum, and as a result, the height of the head chip 1 is changed. At this time, the contact portion 2E comes into contact with the rotation base and serves to hold the narrow width portion 2C so that it can be twisted as a stable rotation fulcrum in one direction.

FIG. 5 is a plan view showing a third embodiment of the present invention, and FIG.
The figure is a partial sectional view thereof. Also in FIGS. 6 and 6, the same reference numerals are given to each part because they are used in the first and second implementations. In the third embodiment, the head chip 7, which should be provided very close to the rotational direction 9 of the head chip 1 in the second embodiment, is mounted on the same head base 2. As you can clearly see, 7 runs, 9th part, 6A
This example uses the same principle as the second embodiment in which a head height adjustment screw 6 having a head height adjustment screw 6 is used, and shows an example in which a contact portion 2E is shared between the head tip 1 and the head chip 8. It is something. With this, a single head base 2 is used in which the heights of the head chips 1 and 8 can be adjusted independently, and the head chips 1 and 8 are extremely close to each other. It is.

Effects of the Invention As described above, according to the present invention, even if the radial length of the rotary base is extremely small, stable and reliable height adjustment of the head chip can be achieved with a simple configuration. Become. This is caused by the fact that the head chip of a rotary transformer is mounted at the same height as the tape guide cylinder of a VTR, DAT, etc., which is becoming smaller in diameter. This can also meet the demand for a reduction in the radial dimension of the head chip base, and as a result, it is possible to make the small diameter tape guide cylinder thinner.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a first embodiment of the present invention, and FIG.
The figure is a sectional view of the same, FIG. 3 is a plan view showing the second embodiment, FIG. 4 is a sectional view of the same, and FIG. 5 is a plan view showing the third embodiment.
FIG. 6 is a sectional view of the same, and FIG. 7 is a sectional view showing a conventional example. 1...Head chip, 2...Head base, 2A...Head chip mounting part, 2B...
...Screw engagement part, 2C...Narrow width part, 2E.
...Abutting part, 2F...Fixing part, 4...
...Rotating base, 6...Head height adjustment screw. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 4 @ Figure 2 Figure 3 Figure 4 Figure 5

Claims (3)

[Claims] (1) It has a rotary base on which the head base is attached, and a head height adjustment screw that is screwed into a female screw threaded on the rotary base and engaged with the head base, and further includes a head height adjustment screw that is engaged with the head base. A fixing part fixed to the rotation base by a fixing screw, a head chip mounting part, and a screw engaging part located on an extension of the head chip mounting part on the rotation center side and engaging with the head height adjustment screw. and a narrow portion extending substantially in the rotational direction and connecting the fixing portion, the head chip attaching portion, and the screw engaging portion at a position extending from the head chip attaching portion to the screw engaging portion. A rotating head device featuring: (2) The rotating head device according to claim 1, further comprising a pair of narrow width portions and a fixing portion via a head chip attachment portion and a screw engagement portion. (3) It has a pair of narrow width parts via the head chip attachment part and the screw engagement part, one of the narrow width parts is connected to the fixed part fixed to the rotating base by the fixing screw, and the other The rotary head device according to claim 1, further comprising a portion that abuts the rotary base.